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Old 21st February 2010, 08:09 PM   #1
struts is offline struts  Sweden
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Default Fried component in Velodyne sub

Hi there,

A friend of mine has a Velodyne sub which has developed a problem. Opening it up it appears that one of the components on the servo is fried and has started oozing:

Click the image to open in full size.

He called Velodyne but they want to sell him a new board for over $500. Seems to me that component is likely the problem and I'd just replace it if I knew what it was. The text on the side is "917Td701".

The sub is a
model HGS12BGE from 1999.

Thanks in advance for any clues
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Old 22nd February 2010, 03:41 AM   #2
db! is offline db!  Canada
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That appears to be a small cermet trimpot. These do not contain electrolytes or anything that could leak.The black/browning material could actually just be epoxy to prevent the trimpot from rotating. Are you sure this part is actually fried/the culprit?
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Old 22nd February 2010, 07:53 AM   #3
struts is offline struts  Sweden
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Thanks db! My friend confirmed it has 3 pins so that would figure. Back to the drawing board..
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Old 24th February 2010, 01:39 AM   #4
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Check the piezo element that's located in the cone. There should be a couple extra wires (probably from that board) going to it. The piezo is used as a stress pickup to determine acceleration for the servo control logic. For me, I've seen many dead ones.

Consider returning it to the company if they offer a repair service, as it will require alignment after replacing, if it's even possible to get in there without damaging the dustcap.

Good luck. How to test it, I don't know. Try here as a stating place: Piezoelectricity - Wikipedia, the free encyclopedia
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